Stargate: War Begins is a full conversion for the awesome tactical fleet simulator Nexus: The Jupiter Incident. We intend to recreate the feeling of the hit Sci-fi Tv shows Stargate SG-1, Stargate Atlantis and Stargate Universe. Our goals are to implement all of the ships seen in the series, and the original Stargate movie, and to release a full single player campaign, with configurable ships, and all the oppurtunities Nexus can provide.

It's the new design of the 303 mkII, it doesn't have active camouflage but it's design allows it to run more efficiently, reducing the emissions to a minimum.
That and because it's in close orbit to a moon, blocking all sensors from the planet.